紫外光晶片中搭配RGB螢光粉混出白光的照明系統中，最急待提升的是紅色螢光粉的發光性質，Y6WO12是一種在近紫外光中可發紅光的潛力材料。本研究旨在合成EuxY6-xWO12為主體的紅光螢光粉並探討其發光特性。
於1300℃/6 h合成的EuxY6-xWO12螢光粉體，其放光強度是隨Eu3+離子濃度之增加而提高， x = 0.9的螢光粉擁有最大放光強度；Eu3+摻雜量超過0.9，會導致濃度淬滅的發生，使得放光強度急遽降低。EuxY6-xWO12螢光粉的5D07F2(605 nm)衰退時間是在0.6~0.7 (ms) 之間，並沒有明顯縮短的情況，此表示無非輻射能量傳遞的發生。EuxY6-xWO12螢光粉的非對稱指數(5D07F2 / 5D07F1 強度比值)約為3，因此EuxY6-xWO12螢光粉的5D07F2(605 nm)放射強度高於5D07F1(588 nm)之放射強度。
合成的EuxY6-xWO12螢光粉其CIE色度座標為( 0.64, 0.36)，相當接近國際標準紅光的座標(0.67, 0.33)。其EuxY6-xWO12螢光粉之量子效率當x = 0.9時可達20.6。
為了增強EuxY6-xWO12螢光粉的發光性質，本研究利用熔鹽法( Flux fusion method )製備EuxY6-xWO12螢光粉體。助熔劑材料的選擇為NH4Cl。EuxY6-xWO12 (x = 0.3)螢光粉添加2wt% NH4Cl，其發光強度增加29.4%；EuxY6-xWO12 ( x = 0.7、0.9 )螢光粉添加4 wt% NH4Cl，其發光強度分別增加15.4、28.3%。EuxY6-xWO12 ( x = 0.9 )螢光粉於添加4wt% NH4Cl之量子效率提升為24.7%。

For the system of white UV- LEDs fabricated by UV-LED chips coated with RGB tri-color phosphors, the most important issue is to enhance the efficiency of red phosphor. The Y6WO12:Eu3+ phosphor is one of the potential materials that can emit red color under near -UV region excitation. The main work in the study is to synthesize and discuss the luminescent properties of Y6WO12:Eu3+.
The PL emission intensity of EuxY6-xWO12 phosphor of 5D0→7F2 transition was increased with Eu3+ contents (x = 0.1~0.9). The optimal PL emission intensity of EuxY6-xWO12 phosphor of 5D0→7F2 transition was at x = 0.9; when x > 0.9, the PL emission intensity of 5D0→7F2 transition decreased due to the concentration quenching occurred. The decay time of EuxY6-xWO12 (x = 0.1~1) phosphor of 5D0→7F2 transition was about 0.6~0.7 (ms) , and the decay time did not descend obviously , which means the nonradiative energy transfer did not happened in EuxY6-xWO12 phosphor . The asymmetry ratio (5D0 -- > 7F2 / 5D0 -- > 7F1) of EuxY6-xWO12 (x = 0.1~1) was about 3, which caused the PL emission intensity of EuxY6-xWO12 (x = 0.1~1) phosphor of 5D0→7F2 transition was higher than 5D0→7F1 transition. The chromaticity coordinates of the EuxY6-xWO12 (x = 0.1~1) phosphor was at (0.64, 0.36), which quite near the chromaticity coordinates of the standard red color (0.67, 0.33). The quantum efficiency of EuxY6-xWO12 (x = 0.1~1) phosphor was 20.6 when x = 0.9.
In order to enhance the PL emission intensity of 5D0→7F2 transition of EuxY6-xWO12 phosphor, synthesis of the EuxY6-xWO12 phosphor by the flux fusion method was also investigated. The NH4Cl was selected as flux material. The PL emission intensity of 5D0→7F2 transition of EuxY6-xWO12 ( x = 0.3 ) with 2wt% NH4Cl increased 29.4%；And the PL emission intensity of 5D0→7F2 transition of EuxY6-xWO12 (x = 0.7, 0.9) with 4wt% NH4Cl increased 15.4, 28.3%, respectively. And the quantum efficiency of EuxY6-xWO12 ( x = 0.9) with 4wt% NH4Cl was 24.7% .

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